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PAL to me has large area flicker, the screen refresh rate being 50Hz is quite visible to my eyes. 60Hz (NTSC) isn't anywhere near as bad. Though I found that I have to set my VGA computer monitor displays to 75Hz to avoid large area flicker. From what I understand, the brightness of the display makes flicker worse, for a given refresh rate. Back in the day when color CRTs were not at all bright (you'd have to draw the shades on the windows during the day to watch the soap operas) 50Hz refresh may not have flickered.
Heard that some fancy modern sets use field store memories so the screen can be refreshed at 100Hz rate to get rid of the large area flicker on bright displays
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